How many periods are there in modern periodic table


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How many groups and periods are there in the modern periodic table? How do the atomic size and metallic character of elements vary as we move : (a) down a group and (b) from left to right in a period

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There are 18 groups and 7 periods in the modern periodic table. (a) The atomic size and metallic character of elements increase down a group. (b) The atomic size and metallic character of elements decrease from left to right in a period.

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